<div dir="ltr"><div>Mehdi,</div><div><br></div><div> Sorry, I misread his original post. </div><div><br></div><div> So something like:</div><div><br></div><div> XXXInsrtInfo *XII; // target instruction info</div><div> MachineBasicBlock::iterator MI = MachineBasicBlock(YourCallInst);</div><div> MachineBasicBlock *MBB = YourCallInst->getParent(); // basic block location of your call inst</div><div> BuildMI(*MBB, MI, DebugLoc(), XII->get(XXX:::INSTRUCTION)......);</div><div><br></div><div>The BuildMI params are going to depend on what you want to do with the instruction being inserted. </div><div> <a href="http://llvm.org/docs/doxygen/html/MachineInstrBuilder_8h.html">http://llvm.org/docs/doxygen/html/MachineInstrBuilder_8h.html</a></div><div><br></div><div>-Ryan</div><div><br></div><div> </div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Sep 4, 2016 at 1:45 AM, Mehdi Amini <span dir="ltr"><<a href="mailto:mehdi.amini@apple.com" target="_blank">mehdi.amini@apple.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="-ms-word-wrap: break-word;"><br><div><span><blockquote type="cite"><div>On Sep 3, 2016, at 6:18 PM, Ryan Taylor via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:</div><br><div><div dir="ltr"><div>So one way might look like this:</div><div><br></div><div>IRBuilder<> Builder(&*BB); // BB = Function::iterator OR IRBuilder<> Builder(CallInst->getParent())<wbr>;</div><div>Builder.SetInsertPoint(<wbr>CallInst);</div><div>InstructionClass *YourNewInstruction = builder.<wbr>CreateInstructionClass(.....); // InstructionClass = type of instruction you are inserting</div><div></div><div><br></div></div></div></blockquote><div><br></div></span>I’m not sure how the IRBuilder would work at the MI level, as Shucai was asking.<span><div><br></div><blockquote type="cite"><div><div dir="ltr"><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Sep 3, 2016 at 6:04 PM, Ryan Taylor <span dir="ltr"><<a href="mailto:ryta1203@gmail.com" target="_blank">ryta1203@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><p dir="ltr">Take a look at IRBuilder and SetInsertPoint().</p>
<div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Sep 3, 2016 18:02, "SHUCAI YAO via llvm-dev" <<a href="mailto:llvm-dev@lists.llvm.org" target="_blank">llvm-dev@lists.llvm.org</a>> wrote:<br type="attribution"></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"><div><div><div dir="ltr"><span style="font-family:arial,helvetica,sans-serif;font-size:13px">I'm trying to insert some instructions before each function calls (before arguments push):</span><br><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"> lea %EAX, label ----- new instructions</span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"> mov [ESP+stacksize], %EAX ----- new instructions</span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"> push arg1</span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"> push arg2</span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"> ...</span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"> push argn</span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"> call callee_name</span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px"><br></span></div><div><span style="font-family:arial,helvetica,sans-serif;font-size:13px">I am a newbie to LLVM. I tried to use buildMI() to insert the instructions in the lowercall() function. But I couldn't put these instructions in the right positions. Is there a way to locate the position by using MachineBasicBlock iterator?</span></div></div></div></div></blockquote></div></div></blockquote></div></div></div></blockquote><div><br></div></span><div>Can you describe more precisely what are you trying to achieve?</div><div>I.e. what are these instructions? Why do you want to do that? It may lead to a different answer.</div><div><br></div><div>— </div><span class="HOEnZb"><font color="#888888"><div>Mehdi</div></font></span></div></div></blockquote></div><br></div>